evidence collection and crime scene investigation
TRANSCRIPT
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Evidence Collection and Crime Scene Investigation
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Evidence
Objective: Differentiate between the different types of evidence
Do Now: Is blood evidence 100% conclusive?
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Locard’s Exchange Principle
“When a person comes into contact with an object or another person, a cross-transfer of physical evidence can occur.”
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Types of Evidence
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Types of Evidence
1. Direct: firsthand observations (eyewitness account, video camera, confessions) shows that something is a fact without inference or presumption
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Types of Evidence
2. Circumstantial: indirect evidence; implies a fact, but does not directly prove it requires making an inference
Trace Evidence:a) Physical – bullets, weapons,
impressionsb) Biological – body fluids, plant parts,
hair
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Trace Evidence
Small but measurable amounts of physical or biological material found at a crime scene
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Examples of Trace Evidence
Hair
Fibers
Soil
fingerprints
Body fluids (semen, blood, saliva, mucus)
Paint chips
Broken glass
Chemical residue
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Categories of Evidence
Class Evidence
Narrows identity to a group of persons or things
Example: blood type
Individual Evidence
Narrow identity to a single person or thing
Example: fingerprint
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Your Task
In your groups complete “Identifying types of evidence” activity.
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Closure
Identify what evidence you can collect at this scene
State whether its biological or physical then state if its class or individual.
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Objective: Problems with evidence collection
Do Now: Can you convict someone on circumstantial evidence alone?
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Case Study
http://www.youtube.com/watch?v=dr6uTw2Eh6M
Complete the case study on OJ Simpson
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Objective: Observe Locard’s Principle
Do Now: What led to OJ Simpsons acquittal?
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Objective: proper evidence collection
techniques
Do Now : What is trace evidence?
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Complete the locard’s principle lab in your groups.
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Your cloth swatches go in ziplock bags (number them with CS#)
Analyze each with magnifying glass etc. and take notes/observations.
Obtain a crime scene evidence bag from Mr. Palermo
Analyze the sock in evidence bag and match it to one of the crime scenes based on your notes/observations
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Objective: how to process a crime scene
DO NOW: Why is it important to photograph a crime scene?
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The Crime Scene Investigation Team
Who is at the crime scene?
Police and possibly a district attorney.
Crime scene investigators.
Medical examiners.
Detectives.
Specialists.
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The Seven S’s of Crime Scene Investigation
1. Secure the scene. 2. Separate the witnesses. 3. Scan the scene. 4. See that photos are taken. 5. Sketch the scene. 6. Search for evidence. 7. Secure the collected evidence.
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1. Secure the Scene
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2. Separate the Witnesses
Do not allow witnesses to talk to each other
Witness accounts will be compared
Avoid witnesses working together to create a story
Asked: who, what, where?
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3. Scan the scene
Determine primary and secondary crime scenes
Primary: where murder took placeSecondary: where corpse was found
Where should photos be taken?
Wear protective gear to prevent contamination of crime scene
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Marking Evidence
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4. See that photos are taken
Show the scene exactly as it was when you first saw it
If something was moved before you arrived, don’t try to reconstruct the scene – just take the pictures the way you see it
Be careful not to destroy any evidence while taking photos
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Overall Shots – Outside the Scene
Exit (door)
First shot entering door:
Outside science office
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Overall Shots – Inside the Scene
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Evidence: Knife (possible weapon)
Midrange Photo Close-Up (with ruler)
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5. Sketch the Crime Scene
Make accurate rough sketch
Note direction (N) and scale of distance
Include relevant objects (body, doors, windows, furniture, immovable landmarks)
Make final copy for court
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Rough sketch
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Final Sketch
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6. Search for evidence
Grid, strip or lane, spiral search pattern
Use flashlight to find hair and fibers
Use forceps, vacuum cleaner to collect evidence
Grid Strip or Lane Spiral
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7. Secure the Evidence
Properly package, seal, and label ALL evidence!
Liquid: airtight, unbreakable containers
Wet items (biological): dry out in breathable container
Dry item: bindle plastic or paper container
Seal with tape and labeled with pertinent info
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The Chain of Custody
In order to present credible evidence in court, a chain of custody log is essential. (in real life there is more involved but for this class do as follows)
Bag evidence (seal, sign and date)
Fill out evidence log every time you open it.
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Processing the crime scence
http://www.youtube.com/watch?v=ur1GxXZGnNI
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Objective: Sketch a crime scene
DO NOW: What happens if the chain of custody is broken for a piece of evidence?
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Rough Sketch Questions
Using the rough sketch complete the questions.
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Lab Sketching the Crime Scene
In your groups complete the lab on sketching the crime scene.
Divide up the work. Have some members:
1. Take measurements
2. Sketch
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Objective: finish crime scene sketch
Do now: Why does each piece of evidence have 2 measurements going to it? (triangulation)
Quiz tomorrow on units 1 and 2 (look over your notes)
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Objective: finish crime scene sketch
Make sure that you have done the following:• 1 rough sketch • 1 final sketch (scaled) • Each piece of evidence has 2
measurements going to it• Key or legend • North indicated on sketch• Location, date of drawing
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Objective: Case Study
DO NOW: In your crime scene sketches, why is it important to show which direction North is?
Hand in crime scene lab
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Objective: Case Study
Complete the woodchipper case study.
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Evidence Recovered
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Conclusion
What was the outcome of the case?